shadow volume
http://developer.nvidia.com/object/robust_shadow_volumes.html
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research On shadows
http://graphics.cs.lth.se/research/shadows/
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CG shadow volume
http://www.gamedev.net/reference/articles/article1990.asp
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graphic card and shadow
http://www.nvnews.net/previews/geforce_6600_series/
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shadow techenology in Gamedev
http://www.devmaster.net/articles/shadow_techniques/
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UltraShadowII Technology
http://www.nvidia.com/object/feature_ultrashadow2.html
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brown大学 gameresearch组对于shadow的研究
http://graphics.cs.brown.edu/games/FastShadows/index.html
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